Can the oil pan on a Ford E350 van with 351 gas engine be removed and replaced without raising from motor mounts?

It's *highly unlikely* you can remove and replace the oil pan on a Ford E350 with a 351 gas engine without raising the engine somewhat. While there might be *extremely* limited clearance in some specific scenarios, the oil pan is usually nestled low in the frame, and access is severely restricted. Even a small amount of lifting, enough to create some working space, will dramatically improve your chances of success and prevent damage.

Attempting to do it without lifting will likely lead to:

* Stripped bolts: Difficult access makes it easier to round off bolt heads.

* Damaged oil pan: You risk scratching or damaging the pan during removal and installation.

* Frustration and wasted time: The process will be significantly more difficult and time-consuming.

In short, while theoretically possible in an extremely rare, perfectly-aligned situation, raising the engine even slightly is strongly recommended for a successful and damage-free oil pan replacement. Using engine supports is the safest and easiest method.